Self-fitting stair-riser.



M. PRGH.

SELF FITTING STAIR RISER.

APPLICATION FILED AUG. 25, 1911.

1,046, 1 65 Patented Dec. 3, 1912.

a H g B FIG@ . /V VEN TOR A TTOR/VEY MoGENs FRCH, oF NEW YORK, N. Y.

SELF-FITTING STAIR-RISER.

To all 'whom t may concern:

Be it known that I, MOGENS FRCH, a citizen of Denmark, and a resident ofBrooklyn borough, New York city, State of New York, have inventedcertain new and useful Improvements in Self-Fitting Stair-Risers, ofwhich the following is a specification.

As heretofore constructed, risers for stairs and stair-ways have had tobe made of a definite height calculated from the number of steps tooccupy a given space. This has involved a great deal of labor inerecting the stair-ways as the successive frames have to be securedtogether by bolts or otherwise with great accuracy to make the riserscorrespond with the carriers. Obviously, a riser intended for a 6%, inchrise, would not lit where 7 inches or 6 inches were required. All thislabor of erection is saved and there are many other advantages in myimproved riser which is so constructed as to slip into the portion ofthe stair frame which is designed to receive it only to that distancewhich is permitted by the structure of the carrier. As the riser doesnot support the weight of the tread, commonly marble or other stone, butthe carrier does, it is no-t necessary for the riser to do more thaninterlock with the socket, sutliciently to attain the necessary rigidityagainst forward and back displacement.

The riser, according to my invention, may either be adapted to the lowerforward side of the portion of the frame, which receives the stairtread, or to the upper side of the rear edge as desired. Whichever placeis selected for the riser, the other place is selected for the socket.Thus it will be seen that the stair frame can be erected by simplysetting the successive steps, one upon the other, the riser of one stepinterlocking with the socket of the next step. No bolts or otherfastening will be required the weight of the stair tread beingsufficient to force the riser into the socket as far as the carrierpermits. It will thus be seen that where, for any reason, the spacebetween successive treads are made to vary the improved riseraccommodates itself to that variation auto- Specicaton of LettersPatent.

Application led August 25, 1911.

Patented Dec. 3, 1912.

Serial No. 645,993.

matically, and for this reason, I call the riser a self-fitting riser;meaning thereby, that it readily adapts itself andfits the socket whenthe socket assumes the position upon the stair tread taking its placeupon the carrier. In the accompanying drawing, I have shown twoapplications of my invention.

In Figures l and 2, the riser descends into the socket of the stairframe below, and in Figs. 3 and 4c, the socket of the stair above, uponthe upwardly projecting riser. Figs. l and 3, are front elevations.Figs. 2 and et, are vertical sections.

Same letters indicate similar parts in the different drawings.

A, represents the usual Stringer to which the usual carriers B, B, aresecured in the usual way.

C, C, are the stair treads which may be'of any suitable material, but inwork of this kind, are generally marble or other stone.

D, D, are riser frames, adapted to slip into each other as shown inFigs. 2 and 4L by having the vertical portion of the riser slip vintothe socket E, which in one case, is at the top of the tread portion ofthe riser frameto receive the iange of the riser above and in the othercase, projects downwardly from the tread portion to receive the iiangeof the riser below.

The many uses and advantages of my invention, will be, I think, readilyunderstood by architects, builders, and others without furtherexplanation.

I claim:

A self fitting stair riser which comprises a tread surface portion, avertical flange projecting from one edge, and a vertical socketprojecting from the other edge, in the opposite direction from saidvertical liange; said flange and socket adapted to engage freely andadjust themselves in connection with the socket and ange respectively ofthe adjacent stair risers.

MOGENS FRCH.

Witnesses:

G. LEONHARD SCHUEPF, W. P. PREBLE, Jr.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

